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SCM-33 molecular sieve as well as preparation method and application thereof

A technology of SCM-33 and molecular sieves, applied in the field of molecular sieves, can solve the problems of inability to introduce catalytic active centers, high synthesis costs of molecular sieves, and low crystal growth rate, and achieve the effects of shortening the synthesis cycle, strong acidity, and short crystallization time

Active Publication Date: 2021-11-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] RUB-3 is currently the only molecular sieve with RTE topology, but it faces the following problems in synthesis: 1) The organic template exo-2-aminobicyclo[2.2.1]heptane is expensive and used in large quantities, and molecular sieves The synthesis cost is high; 2) The crystal growth rate is low, and the synthesis cycle is more than 90 days, even up to 1 year; 3) The crystal is a columnar shape with a size of 50×50×150 μm, which is too large; 4) There is only Si element in the skeleton, which cannot Introducing catalytically active centers

Method used

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  • SCM-33 molecular sieve as well as preparation method and application thereof
  • SCM-33 molecular sieve as well as preparation method and application thereof
  • SCM-33 molecular sieve as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 2.5g of sodium metaaluminate (Al 2 o 3 41wt%,Na 2 (58wt%), 17.5g potassium hydroxide solution (30wt%) are dissolved in 28g water, add 39.4g isopropyltrimethylammonium hydroxide solution (20wt%) and stir well, finally slowly add 60g Ludox AS- 40 silica sol, stirred for 1 hour, then put the above mixture into a crystallization kettle lined with polytetrafluoroethylene, and placed it in an oven at 155°C for crystallization for 144 hours. After the reaction, the solid was filtered, washed with distilled water and dried at 100°C to obtain the original powder SCM-33 molecular sieve. XRD patterns such as figure 1 shown. The original powder solid is placed in a muffle furnace and roasted at a temperature of 550 ° C for 5 hours to obtain the final product. The XRD pattern is as follows: figure 2 shown. The SEM photo of SCM-33 molecular sieve is as image 3 shown.

[0050] Wherein, the XRD spectrogram data of the final product gained in embodiment 1 is as shown in table...

Embodiment 2

[0055] 2.5g of sodium metaaluminate (Al 2 o 3 41wt%,Na 2 (58wt%), 13.7g potassium hydroxide solution (30wt%) are dissolved in 64g water, add 39.4g isopropyltrimethylammonium hydroxide solution (20wt%) and stir well, finally slowly add 60g Ludox AS- 40 silica sol, after stirring for 1 hour, put the above mixture into a crystallization kettle lined with polytetrafluoroethylene, and place it in an oven at 160°C for crystallization for 120 hours. After the reaction, the solid obtained SCM-33 zeolite molecular sieve after filtration, washing, drying, and roasting (aftertreatment reaction conditions are the same as in Example 1), and the XRD spectrum and figure 2 similar. Wherein, the XRD spectrogram data of embodiment 2 gained final products are as shown in table 2:

[0056] Table 2

[0057]

[0058]

Embodiment 3

[0060] With 7.5g sodium hydroxide solution (30wt%), 15g potassium hydroxide solution (30wt%), 40g H 2 O, 47.3g isopropyltrimethylammonium hydroxide solution (20wt%) stirs evenly, slowly adds 45g Ludox AS-40 silica sol under stirring, adds 6.6g USY molecular sieve (SiO 2 / Al 2 o 3 =12), after stirring for 1.5 h, the above mixture was put into a crystallization kettle with a polytetrafluoroethylene liner, and placed in an oven at 165° C. for crystallization for 96 hours. After the reaction, the solid obtained SCM-33 zeolite molecular sieve after filtration, washing, drying, and roasting (aftertreatment reaction conditions are the same as in Example 1), and the XRD spectrum and figure 2 similar. Wherein, the XRD spectrogram data of embodiment 3 gained final products are as shown in table 3:

[0061] table 3

[0062]

[0063]

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Abstract

The invention discloses an SCM-33 molecular sieve as well as a preparation method and application thereof. The SCM-33 molecular sieve has a schematic chemical composition as shown in the formula 'SiO2.1 / xXO1.5.mMO0.5', wherein X is a framework trivalent element, the Si / X molar ratio x is greater than or equal to 5, M is a framework equilibrium cation, and the M / Si molar ratio m is greater than 0 and less than or equal to 1. The molecular sieve is a novel molecular sieve with an RTE topological structure, is short in required preparation time and low in synthesis cost, and can be used as an adsorbent or a catalyst.

Description

technical field [0001] The invention relates to the field of molecular sieves, in particular to an SCM-33 molecular sieve and its preparation method and application. Background technique [0002] Zeolite molecular sieve is a kind of porous crystalline material with regular molecular size pore structure, strong acidity and high hydrothermal stability. It is widely used in the fields of catalysis, adsorption and ion exchange, and plays an irreplaceable role. effect. At present, there are 248 molecular sieve topologies approved by the International Molecular Sieve Association. [0003] In 1995, Marler et al. first reported the synthesis of pure silicon molecular sieve RUB-3 and analyzed its structure (Zeolites, 1995, 15, 388–399). Since then, this molecular sieve has been awarded the structure code RTE by the International Molecular Sieve Association. Molecular sieve with RTE structure is composed of rte([4 4 5 4 6 2 ]) units and [4 6 5 4 6 6 8 2 ] cage structure, and ...

Claims

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Application Information

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IPC IPC(8): C01B39/48C01B39/06C01B39/12C01B39/08B01J20/18B01J20/30B01J29/70
CPCC01B39/48C01B39/06C01B39/12C01B39/087B01J20/18B01J29/70C01P2004/62C01P2002/72C01B39/08B01J20/3085B01J20/30B01J20/3042B01J20/3057B01J29/7049B01J29/72B01J37/0018B01J37/031B01J37/04C01B39/065C01P2002/74C01P2002/76C01P2004/03
Inventor 杨为民付文华王振东袁志庆滕加伟乔健陶伟川
Owner CHINA PETROLEUM & CHEM CORP
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